Snake game (ncurses version) - snake.cpp

#include "snake.h"
using namespace std;
snakepart::snakepart(int col,int row)
{
    x=col;
    y=row;
}

snakepart::snakepart()
{
    x=0;
    y=0;
}
snakeclass::snakeclass()
{
    initscr();
    nodelay(stdscr,true);           //if there wasn't any key pressed don't wait for keypress
    keypad(stdscr,true);            //init the keyboard
    noecho();                                   //don't write
    curs_set(0);                            //cursor invisible
    getmaxyx(stdscr,maxheight,maxwidth);
    partchar='x';
    oldalchar=(char)219;
    etel='*';
    food.x=0;
    food.y=0;
    for(int i=0;i<5;i++)
        snake.push_back(snakepart(40+i,10));
    points=0;
    del=110000;
    get=0;
    direction='l';
    srand(time(NULL));
    putfood();
    //make the game-board -- up-vertical
    for(int i=0;i<maxwidth-1;i++)
    {
        move(0,i);
        addch(oldalchar);
    }
    //left-horizontal
    for(int i=0;i<maxheight-1;i++)
    {
        move(i,0);
        addch(oldalchar);
    }
    //down-vertical
    for(int i=0;i<maxwidth-1;i++)
    {
        move(maxheight-2,i);
        addch(oldalchar);
    }
    //right-horizontal
    for(int i=0;i<maxheight-1;i++)
    {
        move(i,maxwidth-2);
        addch(oldalchar);
    }
    //draw the snake
    for(int i=0;i<snake.size();i++)
    {
        move(snake[i].y,snake[i].x);
        addch(partchar);
    }
    move(maxheight-1,0);
    printw("%d",points);
    move(food.y,food.x);
    addch(etel);
    refresh();
}

snakeclass::~snakeclass()
{
    nodelay(stdscr,false);          //turn back
    getch();                                        //wait until a key is pressed
    endwin();
}

void snakeclass::putfood()
{
    while(1)
    {
        int tmpx=rand()%maxwidth+1;
        int tmpy=rand()%maxheight+1;
        for(int i=0;i<snake.size();i++)
            if(snake[i].x==tmpx && snake[i].y==tmpy)
                continue;
        if(tmpx>=maxwidth-2 || tmpy>=maxheight-3)
            continue;
        food.x=tmpx;
        food.y=tmpy;
        break;
    }
    move(food.y,food.x);
    addch(etel);
    refresh();
}

bool snakeclass::collision()
{
    if(snake[0].x==0 || snake[0].x==maxwidth-1 || snake[0].y==0 || snake[0].y==maxheight-2)
        return true;
    for(int i=2;i<snake.size();i++)
    {
        if(snake[0].x==snake[i].x && snake[0].y==snake[i].y)
            return true;
    }
    //collision with the food
    if(snake[0].x==food.x && snake[0].y==food.y)
    {
        get=true;
        putfood();
        points+=10;
        move(maxheight-1,0);
        printw("%d",points);
        if((points%100)==0)
            del-=10000;
    }else
        get=false;
    return false;
}


void snakeclass::movesnake()
{
    //detect key
    int tmp=getch();
    switch(tmp)
    {
        case KEY_LEFT:
            if(direction!='r')
                direction='l';
            break;
        case KEY_UP:
            if(direction!='d')
                direction='u';
            break;
        case KEY_DOWN:
            if(direction!='u')
                direction='d';
            break;
        case KEY_RIGHT:
            if(direction!='l')
                direction='r';
            break;
        case KEY_BACKSPACE:
            direction='q';
            break;
    }
    //if there wasn't a collision with food
    if(!get)
    {
        move(snake[snake.size()-1].y,snake[snake.size()-1].x);
        printw(" ");
        refresh();
        snake.pop_back();
    }
    if(direction=='l')
    {
        snake.insert(snake.begin(),snakepart(snake[0].x-1,snake[0].y));
    }else if(direction=='r'){
        snake.insert(snake.begin(),snakepart(snake[0].x+1,snake[0].y));

    }else if(direction=='u'){
        snake.insert(snake.begin(),snakepart(snake[0].x,snake[0].y-1));
    }else if(direction=='d'){
        snake.insert(snake.begin(),snakepart(snake[0].x,snake[0].y+1));
    }
        move(snake[0].y,snake[0].x);
        addch(partchar);
    refresh();
}

void snakeclass::start()
{
    while(1)
    {
        if(collision())
        {
            move(12,36);
            printw("game_over");
            break;
        }
        movesnake();
        if(direction=='q')              //exit
            break;
        usleep(del);            //Linux delay
    }
}